NTP31 Multifunctional Bolt Action Tactical Pen The Nitecore NTP31 is a tactical bolt-action pen fitted with a tungsten-steel glass breaker tip that can be used in self-defense. The sturdy aluminum body features a HA-III military grad hard-anodized finish for corrosion resistance, and the stainless-steel pocket clip won't snap under pressure like typical plastic clips. Notable Features ? Tungsten Steel tapered tip rated 89 - 92.5HRA hardness (second only to diamond) for glass breaking ? CNC-machined aluminum alloy body with HA II grade hard-anodized finish for corrosion resistance ? Bidirectional L-shaped bolt design controls pen and steel tip retraction ? Takes high-quality Schneider Gelion 39 Ballpoint Pen Refill SPECIFICATIONS BrandNitecore SeriesNTP MPNNTP-31 ColorBlack ActivityWriting, EDC MaterialAluminum Alloy Tungsten Steel Tip RefillSchneider Gelion 39 Ballpoint Pen Refill